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 * The MIT License (MIT)                                                         *
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 * Copyright (c) 2015-2022 aoju.org and other contributors.                      *
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package org.aoju.bus.core.lang;

import org.aoju.bus.core.lang.mutable.MutableObject;

/**
 * 为不可变的对象引用提供一个可变的包装,在java中支持引用传递
 *
 * @param <T> 所持有值类型
 * @author Kimi Liu
 * @version 6.5.0
 * @since Java 17+
 */
public final class Holder<T> extends MutableObject<T> {

    /**
     * 构造
     */
    public Holder() {

    }

    /**
     * 构造
     *
     * @param value 被包装的对象
     */
    public Holder(T value) {
        super(value);
    }

    /**
     * 新建Holder类,持有指定值,当值为空时抛出空指针异常
     *
     * @param <T>   被持有的对象类型
     * @param value 值,不能为空
     * @return Holder
     */
    public static <T> Holder<T> of(T value) throws NullPointerException {
        if (null == value) {
            throw new NullPointerException("Holder can not hold a null value!");
        }
        return new Holder<>(value);
    }

}
